Temporal @ spatial anti-counterfeiting with Mn2+/Bi3+/Er3+ doped BaZnOS phosphors

Fluorescent materials have been employed in the field of anti-counterfeiting thanks to their feasible and flexible design approach, visualization feature, and handy identification. However, versatile fluorescent materials are still eager to be developed for advanced information security. Here, an efficient temporal and spatial anti-counterfeiting strategy is proposed with the multi-response behaviors from the as-explored transition metal and lanthanide ions doped BaZnOS phosphors under distinct stimulus. Diverse optical performance of the corresponding phosphor with the irradiation of X-ray, ultraviolet (UV), and near-infrared laser as well as the stimulation of stress and temperature endows a spatial anti-counterfeiting strategy. Moreover, with the cooperation of the photo-stimulated and up-conversion behaviors, a temporal anti-counterfeiting could be achieved elaborately. Herein, this work not only gives an insight to understand the multi-dimensional response of the corresponding tailored phosphor under distinct exterior stimulations, but also provides a feasible and facilitated way to address the counterfeit issues accordingly.